Representative of Express-24 LLC and author of articles about Electronics manufacturing and Printed Circuit Boards Repairing - Khramtsov Dmitry. Development, production and sale of fluxes for soldering electronics and repairing printed circuit boards. Products developed by the company: Diamond Flux FN231. Gel soldering flux for electronics in syringe. Diamond Flux FN232. Liquid soldering flux for electronics in bottle with brush. Diamond Flux FA241. High Active Gel soldering flux for electronics, Printed Circuit Boards and Plumbing. The Diamond Flux brand belongs to Express-24 LLC Diamond Flux products can be purchased from Digikey, Walmart, Amazon.